Unclear how to add one Kubernetes cluster to different/all projects
Description
For on-prem deployment there is a big chance that there will be just one or two Kubernetes clusters used for the organisation. It makes no sense to add the same cluster to each new project again and again.
In addition, if I add the same cluster to another project, I get installation steps for Tiller, Prometheus, Ingress and Gitlab Runner for it. Only Tiller can be installed and all other tools report as already existing (sounds reasonable) and there is no way, for example, to enable the Prometheus monitoring for the project, since it only works when this particular project has successfully installed Prometheus to Kubernetes.
Proposal
Let administrators to configure one or more clusters and let users to select them for each project. Tools should be detected and show as "installed" if already exist. Prometheus monitoring should have just "Enable" button if Prometheus is already installed in Kubernetes via Gitlab.